Re-convert api from generator-style to async/await style
Re-convert api from generator-style to async/await style

itchio/itchio-app,itchio/itchio-app,itchio/itch,leafo/itchio-app,itchio/itch,leafo/itchio-app,itchio/itch,itchio/itch,leafo/itchio-app,itchio/itchio-app,itchio/itch,itchio/itch